Hay Flat pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Hay Flat is high; eucalyptus is high; cypress is moderate; acacia and grass are low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress declining, eucalyptus declining, acacia no longer expected, grass no longer expected.
7-Day Trend
Over the next week acacia, cypress, eucalyptus, and grass will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Low | 19/100 |
| Cypress (Cupressaceae) | Moderate | 43/100 |
| Eucalyptus (Myrtaceae) | High | 56/100 |
| Grass (Poaceae) | Low | 6/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | None | 0/100 | |
| Cypress (Cupressaceae) | Low | 13/100 | |
| Eucalyptus (Myrtaceae) | Moderate | 26/100 | |
| Grass (Poaceae) | None | 0/100 |
Local Environmental Conditions
Water here is bordered by river oak, a casuarina species known for prolific, far-carrying pollen, just outside the immediate area. Nearby, within easy reach, forest where eucalypt and wattle share the canopy and margins, wattle driving most of the seasonal pollen spike. Year-to-year swings in rainfall and wind can shift this picture somewhat either way.
The water-adjacent river oak is an early riser, topping out well before most other trees start releasing pollen, around July and August. The nearby eucalypt and wattle stands take the lead as winter turns to spring, typically landing in August and September. Grass pollen takes over next, building to a peak around November, with the season extending well into summer before finally winding down in February.
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Frequently Asked Questions About Pollen in South Australia
Is pollen high in Hay Flat right now?
On 20 September 2026, overall pollen levels in Hay Flat are high. Myrtle is the main contributor to airborne pollen, while cypress, grass, and acacia remain at lower levels
Will pollen levels change in Hay Flat tomorrow?
On 21 September 2026, pollen conditions in Hay Flat will be different from today, with cypress, myrtle continuing to decline
Is pollen expected to decrease in Hay Flat this week?
According to the five-day outlook, cypress, myrtle, grass, and acacia pollen levels will increase later in the week.
Which pollen types are currently active in Hay Flat?
On 20 September 2026, Myrtle is the dominant pollen source in Hay Flat. cypress, grass, and acacia are also present but at lower levels.
When is pollen season in Hay Flat?
How often is the Hay Flat pollen forecast updated?
The Hay Flat pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Hay Flat come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Hay Flat based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Hay Flat, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
